Spark-plug.



P. M. WILSON.

SPARK PLUG.

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nueukoz @WQ/W A @N UlTED STATES PATENT FFCE.

.23123 M. WILSON. .QF PRQIDENCE. KRHODE ISLAD. ASSLGNOR OF .ONE-HALF T,AFLES M. B. TAYLDB, 0F PROVlDEliC-, .RHODE ISLAND. Y

'SPARK-PLUG.

Specification of Letters Patent.

Animation and september 24,1909. serial No. mams.

To auwmnrimay eoncern:

Be it known that l. Pn'rizn M'inson. n Citizen of the 'United tirate-s,residing' at Providence. in the county of 1rovidenee and Starte of Rhodelala-nd. have invented new and usefulY improvements in .imrklllugs.

-of Which-the ollffivingfis a\--npecifieation.

This inventionrelater to nnl'irovenients in eleeti'ie parkingdevicespartienlarly spark ning: for iisefor j ftiiting the explosive 1n`the cylinders in internal combustion engines andthe smid inventionconsists in the cenitrnction. combination and arrangement of devireshereinafter shown and described,

-One ohjeet oil the present invention is to effect improve1nent V in theconstruction and arrangement of the eleetrodea` or sparking points so asto prt-'rent short-eirenitingV 'o v the accumulation of soot, or carbonaround Sparliing points.

A further object to prevent the insulator for the central conductor frombecoming saturated and injured` A further object is to etieetimprovements in means for atta 'n g the electrical eonneftions to theventral condnvtor.

in the acompa fing drawings. Figure 1 a vertical longitudinal centralsectional view of a Spark ping consti-tiered in aerox-ih ance -with theinvention. Figs. 2. I3 4. and 5 are detail views.

in accordance with my invention I pro vide a shell or eaing l which ismade of iron. steel or other conducting metal and has an extcriorlvthreaded portion 2 ahich is adapted to he :.f-rewed in a threadedopening in the c vindcr head of an engine to 5ecnre the Shell or easing'thereto. Said Ashell or Casin;r alan has an exterior angular portion I),adapted to he engaged and turned hv a wrench and the outer portion-ofthe said shell is provided with interior screw threads 4, the :hellhaving an inclined annular shoulder 5 at the inner end ot' Saidinteriorlv threaded portion -l and an annular shoulder (i .vhieh ispresented toward and spaced froin the exposed or inner end of the shell.

`The central conductor or inner eonductor 'a' is ineaned i` andextendlongitudinally from end to end of an in nlator S which inzulatorprovided with an annular (firmanferenlial llange J at a uitahlo di tancefrom its inner end. said tlange presenting oppositelv iin-lined orheveled a'nrfaces 10. 11.- collar 152 which may he inade of copper or il i i l l i other suitable material is spaced between the Shoulder i o'ftheehell and the inclined face 1() .off the flange of rthe insulator 8.a sleeve 13 'which i `screw-ed in the threaded portion 4 of the shellhearing*r at ita. inner end against the said flange J and SenfiingY tofirmly hold the insulator in 'ivtlaee in the Vnhell. The inner end o'l'the said sleeve 13 is iared no that the Sleeve presente' hut acomparatively Slight enrt'm'e which heaixV againei the {langtll of theineulator e and hence excessive pressure on the inenlator is preventedwhen the sleeve expande; h v the heat to which it is e'uhieeted when thedevine ie in une. The inner or central vonrinetor T is provided with asparking point or electrode which is Y\ho\vn an a `-erexv H the head ofwhich hears against the inner end of the conductor T and is providedwith a eentnli rear," which reeeiwehA a stud l5 that proie-lifts` frontaid inner conductor.

The exponer). end of the shell is closed by an insulator cap i6 whichhear.c against the shoulder tl and has a threaded central openingrengaged hv the electrode l-i and through which the latter extends.

(ln the unter side of the insulator cap is the outer eleetrfxle l? whichis a dish of Steel or other suitable material and forms a covering forme insulator cap i5 which closes the exposed end of the nhell. saidelectrode dink having' a central opening through which the innerelectrode extenlez. :.:aid inner electrode hein!r spaced from the wallof said opening. the. diameter of said opening exceeding that of theexped end of the .said electrode. This liek is held in place by a flange18 turned or spun. onthe exposed end of the :shell after the insulatorcap or closure 1G and the outer electrode (liek have, been placedassembled in the shell. The inner Side of the electrode disk ishollovrcd as at 19 so that the inner face of said electrode disk isslightly spaced from the insulator cap or closure 1G except ai; theperiphery of the electrode disk where the Same is formed with a Harige:20

Patented Jan. 3, i911.

that hears against the insulator cap orL t elohnre and protects thelatter from hot oil or similar substance which may be thrown against thesaine duinqr the operation of the engine. and it will he alsounder-bloodthat the closure cap or insulator 16 prevents the poseibilityof any hot oil or subetance being hroueht. in Contact with the innerinsulator S so that the hitter is prevented from lfeeoinully ennliloyedfor making insulators for de g vices of this type.

In pine-tice the eleetrode: 14,17 heroine reryliot. due lo thehentol'theeugine und the heut from between theseelectrodes prevents shorteireuitiug media from collecting and servee to destroy the Short.eircuiting qualities of residual elements which might tend to collect:it this point. Furthermore the spari: passing hein-een the electrodesserves to remore or destro; :my short cireuiting inedin which muy lendto :uc'i'nnulnte or collent lle.- tween them. The spurl; points do notreA quire adjustment but remain fixed and the )are between them ispractically unifarying :ind is not :itleeted h r the expansion undcontraction ot' the eleetroflee since it is obvious that. the expnnfionor eonirnetion oi the inner electrode H does not atleet the distancebetween the latter und me wall ot' the opening in the outer electrode.disk I?, and since.

the expansion undv contraction of the outer electrode disk isdistributed throughout the entire surface ot' the laitier and isminimized at its center where the central electrode is exposed. Vaporeor moi nre which muy Condense when the engi e is not in operation undsettle on the expoxd end of the plug would he distrihuted on theelectrode plate in so thin u ihn to he prevented from sinntfeireuitintrthe elertrodes :ind owing to the spare l) between ihe electrode digliund the eloenre @ap or insulator lli Suid disk und rlosure eup orinenlznor hy if-plliny notion will prevent :noie-.ture or rupor fromcondensing on the inner electrode 14 to such un extent :is to render.short-rinzuiing imponsible.

The inenlator S has its outer end reduced in diameter :is at 2] undprovided in opposite sides 'with iererxes The metallic oep Q3 which inpractice preferably nride of tir-.iss

is formed with a sleeve or shell 24 to lit on the redured portion 21 ofthe insulator 8, which Vplace on the outer end of the insulator 8 and iuelectrical Contact with the. inner conductor T. Seid cup is formed withu screw threaded stem 2G on which operates a bindin nut 27. Either formot' the clip or electrical connection shown in Figs. 4: und 5 may besecured between the rap und the binding nutl :1e will he undertood.

Haring thus described the invention what is claimed as new is l. Anelectric sparking device having a shell, an inner conductor having anelectrode detachable therefrom and presented :it the exposed end of theshell, an insulntor in the ehell on said inner conductor, :in insulatorfor the detachable electrode and forming a' closure for the exposed endof the shell, and nn electrode in the exposed end of the 'Shell coveringthe last nznned insulator and having on opening through Wliieh the innerelectrode extends, said inner electrode being spaced troni the wall ofSuid opening.

Q. An electric sparking device having a Snell, :in inner conductorhaving an elect-rode detachable therefrom und presented at the expofedend ot the shell, an insulator in the shell on the Suid inner conductor,an insu-v lator cap in and forming a closure for the expofed end of theshell and having an openingy through which the detachable electrodeextentie. snid detnohuhle electrode being $eeure-1l to the s: idinsulator cap, end an electrode in the exposed end of the Shell COYeringthe insulator cup und having an opening through which the innerelectrode extends,

#nid will of Suid openinf.

ln teetiinony .shereof I atlix may signature in presence of twowitnesses.

PETER M. WILSON.

".Yi'messes:

tiro. L. Coene, Fnomxee l. Ensems.

